Electric vehicles (EVs) have recently been in the spotlight and have been rapidly developed to reduce the carbon emission withrespect to the transport sector. Most EVs currently employ lithium-ion batteries (LIBs) as power sources because they have a higherenergy density and a lower self-discharge than other batteries. However, the LIBs cannot respond to high power demands when the stateof health (SOH) falls below 80%. Therefore, the SOH of the LIBs must be accurately measured or estimated. To date, many methodshave been studied and proposed for measuring or estimating the SOH. In this paper, representative methods among them are reclassifiedand introduced.